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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...Passive LayerPassive Layer
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1/12/2005 9:00 AM
 
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What is the typical passive layer of a stainless steel tube in angstroms? (Based on raw material being .25) Does the passive layer thicken over time? Is a tube that is chemically passivated have a thicker passive layer than a tube that is mechanically passivated?
 
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1/18/2005 9:00 AM
 
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jodyh: The passive layer on an austenitic stainless steel is quite thin, on the order of a couple of angstroms. The film thickness is independent of the thickness of the component. The film forms quickly to a final thickness when sufficient oxygen potential is present. We're not sure how one "mechanically" passivates a stainless steel. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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2/8/2005 9:00 AM
 
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When properly passivated the passive layer (chromium enriched) is 20-30 Angstroms thick. You cannot mechanically passivate stainless steel.
 
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